This product consists of an infrared emitting diode and an NPN silicon phototransistor, encased side-by-side on converging optical axis in a black thermoplastic housing, The phototransistor receives radiation from the IRED only .This is the normal situation. But when an object is in between , phototransistor could not receives the radiation. For additional component information , please refer to IR928-6C-F and PT928-6C-F
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